Transportation Engineering - Vol 2 | 7. IRC Method of Design of Flexible Pavements by Abraham | Learn Smarter
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7. IRC Method of Design of Flexible Pavements

The chapter outlines the procedures specified by the Indian Roads Congress for the design of flexible pavements based on California Bearing Ratio (CBR) values. It extends the previous design methods to accommodate pavements designed for up to 150 million standard axles (msa) through an analytical approach. Key considerations include traffic characteristics, layer thickness, and material specifications to ensure structural integrity and performance over time.

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Sections

  • 28

    Irc Method Of Design Of Flexible Pavements

    The IRC method of designing flexible pavements employs analytical design principles based on CBR values to create pavement structures suited for varying traffic loads.

    Learning Practice

  • 28.1

    Overview

    The IRC specifies design procedures for flexible pavements based on CBR values, now extending up to 150 million standard axles.

    Learning Practice

  • 28.2

    Scope

    The IRC guidelines apply to the design of flexible pavements for various road types, emphasizing the scope and applicability of these designs.

    Learning Practice

  • 28.3

    Design Criteria

    This section outlines the design criteria for flexible pavements, focusing on the analysis of stresses and strains at critical locations due to traffic loads.

    Learning Practice

  • 28.4

    Failure Criteria

    The section outlines the failure criteria for flexible pavements, focusing on tensile and compressive strains at critical locations.

    Learning Practice

  • 28.5

    Design Procedure

    The design procedure outlines the steps for designing flexible pavements based on cumulative traffic loads and subgrade strength.

    Learning Practice

  • 28.6

    Design Traffic

    This section focuses on calculating design traffic for flexible pavement by determining cumulative standard axles, initial traffic, growth rates, design life, vehicle damage factors, and traffic distribution.

    Learning Practice

  • 28.7

    Pavement Thickness Design Charts

    This section provides guidelines for determining pavement thickness based on traffic loads and subgrade CBR values using design charts.

    Learning Practice

  • 28.8

    Pavement Composition

    The section outlines the materials and thickness requirements for different layers of flexible pavements, including sub-base, base, and bituminous surfacing.

    Learning Practice

  • 28.9

    Numerical Example

    This section provides a numerical example demonstrating the pavement design for a new bypass with specific traffic and soil characteristics.

    Learning Practice

  • 28.10

    Summary

    The IRC design procedure incorporates the California Bearing Ratio (CBR), million standard axles, and vehicle damage factors while considering traffic distribution.

    Learning Practice

  • 28.11

    Problems

    This section presents problems associated with the design of flexible pavements based on the IRC guidelines, focused on practical applications and calculations.

    Learning Practice

References

28.pdf

Class Notes

Memorization

What we have learnt

  • Flexible pavements are desi...
  • The design incorporates an ...
  • Key distress mechanisms inc...

Final Test

Revision Tests